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(28*x)/20+x+104 = 20.4 // - 20.4
(28*x)/20+x-20.4+104 = 0
12/5*x+83.6 = 0 // - 83.6
12/5*x = -83.6 // : 12/5
x = -83.6/12/5
x = -34.83333333
x = -34.83333333
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